code: def _sparsemax_bisect_forward(X, dim, n_iter, ensure_sum_one):
      return _entmax_bisect_forward(
          X,
          alpha=2,
          dim=dim,
          n_iter=50,
          ensure_sum_one=True,
          cls=SparsemaxBisectFunction,
      )
  
imports: import torch
  import torch.nn
  from torch.autograd import Function
label_desc: Use image node_id 2 for calling a global function with example usage: _sparsemax_bisect_forward(X, dim, n_iter, ensure_sum_one) and returns: _entmax_bisect_forward